Time, not timing, is what matters

Investors learning how to invest in the stock market might ask when to invest. Knowing when to invest, however, isn’t as important as how long you stay invested.

Trying to navigate the peaks and valleys of market returns, investors seem to naturally want to jump in at the lows and cash out at the highs. But no one can predict when those will occur. Of course we’d all like to avoid declines. The anxiety that keeps investors on the sidelines may save them that pain, but it may ensure they’ll miss the gain. Historically, each downturn has been followed by an eventual upswing, although there is no guarantee that will always happen. 

The chart below shows two hypothetical investments in the S&P 500 over the 20-year period ending December 31, 2023. Each investor contributed $10,000 every year. One investor somehow managed to pick the very best day (the market low) of each year to invest. The average annual return on that investment would have been 12.64%. The other investor was not so lucky and actually picked the worst day (market high) each year. Even with the worst investment timing, the average annual return would have been 10.78%. At the end of 20 years, the cumulative investment of $200,000 had a value of  $640,469.

So even selecting the worst day each year to invest, someone who continued investing in the market over the past 20 years would have come out ahead. It’s important to note that regular investing neither ensures a profit or protects against a loss. However, the tables below illustrate how regular investing can be beneficial.

Timing isn’t critical to long-term success

Best-day investments
(Market lows)

Date of market low

Cumulative investment

Total
  value

8/12/2004

$10,000

$11,477

4/20/2005

20,000

23,161

6/13/2006

30,000

38,529

3/5/2007

40,000

51,497

11/20/2008

50,000

44,492

3/9/2009

60,000

73,046

7/2/2010

70,000

96,473

10/3/2011

80,000

110,019

1/3/2012

90,000

139,049

1/8/2013

100,000

197,035

2/3/2014

110,000

236,058

8/25/2015

120,000

250,353

2/11/2016

130,000

292,773

1/3/2017

140,000

368,770

12/24/2018

150,000

363,269

1/3/2019

160,000

491,111

3/23/2020

170,000

598,487

1/4/2021

180,000

783,348

10/12/2022

190,000

652,253

1/5/2023

200,000

836,444

Average annual total return?

(8/12/2004–12/31/2023): 12.64%

Worst-day investments
(Market highs)

Date of

market high

Cumulative investment

Total
  value

12/30/2004

$10,000

$9,987

12/14/2005

20,000

20,293

12/15/2006

30,000

33,443

10/9/2007

40,000

44,705

1/2/2008

50,000

34,556

12/28/2009

60,000

53,592

12/29/2010

70,000

71,648

4/29/2011

80,000

82,524

9/14/2012

90,000

105,529

12/31/2013

100,000

149,707

12/29/2014

110,000

180,050

5/21/2015

120,000

192,259

12/13/2016

130,000

225,116

12/18/2017

140,000

284,206

9/20/2018

150,000

280,347

12/27/2019

160,000

378,591

12/31/2020

170,000

458,248

12/29/2021

180,000

599,735

1/3/2022

190,000

499,255

12/28/2023

200,000

640,469

Average annual total return
(12/30/2004–12/31/2023): 10.78%

Source: S&P 500 Index

Riding it out

Note that the hypothetical investors above didn’t pull out of the market but stayed the course for 20 years. That perseverance helped improve the chances that they would come out ahead. In fact, history has shown that positive outcomes occur much more often over longer periods than shorter ones.

Over the past 96 years, the S&P 500 has gone up and down each year. In fact 27% of those years had negative results. As you can see in the chart below, one-year investments produced negative results more often than investments held for longer periods. If those short-term one-year investors had held on for just two more years, they would have experienced nearly half as many negative periods.

And the longer the time frame — through highs and lows — the greater the chances of a positive outcome. Indeed, over the past 96 years, through December 31, 2023, 94% of 10-year periods have been positive ones. Investors who have stayed in the market through occasional (and inevitable) periods of declining stock prices historically have been rewarded for their long-term outlook.

  History has shown the longer the period, the greater the chances of a positive outcome

Charts illustrate positive versus negative periods in the S&P 500 Index over the past 96 years, ending December 31, 2023. Over one-year periods, the index had 70 (73%) positive periods and 26 (27%) negative periods. Over three-year periods, the index had 79 (84%) positive periods and 15 (16%) negative periods. Over five-year periods, the index had 81 (88%) positive periods and 11 (12%) negative periods. And over 10-year periods, the index had 82 (94%) positive periods and 5 (6%) negative periods.

Source: S&P 500 Index

Rather than trying to predict highs and lows, it’s important to stay invested through a full market cycle. Focus on the time you stay invested, not the timing of your investments.

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